This carbine is one of over 11,000 altered and refurbished by the Springfield Armory around 1867-1874 with relined three-groove rifled barrels for use with both 56-52 "52 Spencer" and 56-50 "50 Spencer" ammunition, and fitted with a Stabler cut-off. It has the standard Spencer markings and sights, and the left of the stock behind the saddle bar is stamped with a "TJS" inspection cartouche. Absent rear sling swivel.